Well, I guess that'll teach me for not checking someone's profile for a little more 'history' before getting involved.
Chatted back and forth about a bike trailer via email, phoned last night, agreed a price (she was wanting £600, I offered £560 plus £65 for courier and packing). Paid straight away via Paypal, then get an email this morning to say that someone else, responding to an ad placed somewhere else, had offered £700 and that she was really sorry, but unless I paid £700 or more she was going to sell it to the other party!
WTF! I've paid for it! Or should I not be annoyed by this?